OPTICAL FIBER OPTICAL AMPLIFIER

摘要

PURPOSE: An optical fiber optical amplifier is provided to improve noise peculiarity by solving problems that a wave length oscillated by a laser is out of optical signal wave length band amplified or maintains a wave length interval to some degree from optical signals, and by solving problem that the wave length oscillated by a laser is mixed with the optical signal amplified. CONSTITUTION: An optical fiber optical amplifier for fixing gain comprises the first Mach-Zehnder interferometer filter(MZIF1), the second Mach-Zehnder interferometer filter(MZIF2), a pump part, an erbium-doped fiber(EDF), an isolator(ISO), a band pass filter(BPF) and an attenuator(ATT). The first Mach-Zehnder interferometer filter(MZIF1) is connected between an input terminal(IN) and one end of the pump part. The second Mach-Zehnder interferometer filter is connected between one end of the EDF and an output terminal. The attenuator is connected to one end of the second Mach-Zehnder interferometer filter(MZIF2) and controls a magnitude of an optical loss of a resonator in response to an output signal of the MZIF2. The band pass filter(BPF) is connected to an output terminal of the attenuator and determines an ingredient of a wave length of oscillation in response to an output signal of the attenuator(ATT). The isolator(ISO) is connected between an output terminal of the BPF and an input terminal of the MZIF1 and determines a progressive direction of a wave length of oscillation in response to an output signal of the BPF.